loop_ _rcsb_struct_link.id _rcsb_struct_link.vertex_id _rcsb_struct_link.label_comp_id _rcsb_struct_link.label_asym_id _rcsb_struct_link.label_seq_id _rcsb_struct_link.label_atom_id _rcsb_struct_link.symmetry C1 from ARG A 87 NZ1 1_555 C1 to GLU A 92 OE1 1_555 C2 from ARG B 287 N 1_555 C2 to GLY B 292 O 1_555